'''
自定义类库
'''

def sum(a,b):
    print("两个数加和")
    return a+b

def div(a,b):
    return a/b

def sub(a,b):
    return a-b


# print(__name__)
if __name__ == '__main__':
    print("类库的测试sum(10,20)", sum(10, 20))
